期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2020
卷号：570
期号：2
DOI：10.1088/1755-1315/570/2/022057
语种：English
出版社：IOP Publishing
摘要：Casing deformation is a key issue that restricts the efficient development of shale gas in the Sichuan Basin. In this study, the H pad of shale gas wells in this area is used to determine correlations among the casing deformation and ant-tracking faults, microseismic events, and treatment pressure. The results show that the deformation might have been caused by fault slip induced by hydraulic fracturing. Moreover, three-dimensional seismic and well log data are used to establish fracture and in situ stress models based on discrete fracture network and finite element methods, respectively. The relationship between treatment parameters and fault activation is established by hydraulic fracturing simulation, from which the parameter sensitivity is evaluated. The results show that when the fluid volume is reduced by 20%, the length of the activated fault and the number of activated fractures decrease by 9% and 23%, respectively. In contrast, when the pumping rate is reduced by 20%, these parameters decrease by 25% and 38%, respectively. These results indicate that reducing the pumping rate is more effective than reducing the fluid volume for mitigating fault activation. In summary, arranging the fracture stages adjacent to the fracture zones should reduce the pumping rate to some extent. This method can be used to mitigate fault activation during hydraulic fracturing, which in turn can prevent casing deformation.
